Create docker-image.yml

[l3r8yJ]

closes #14

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PR-Codex overview

This PR adds a GitHub Actions workflow to build a Docker image on push and pull request events for the master branch.

Detailed summary:

• Added .github/workflows/docker-image.yml file
• Defined a workflow named Docker Image CI
• Triggered on push and pull_request events for the master branch
• Defined a job named build
• Set the job to run on ubuntu-latest
• Added two steps to the job:
  • actions/checkout@v3 to checkout the repository code
  • docker build . --file Dockerfile to build the Docker image from the Dockerfile in the repository

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